#include <iostream>
#include <cmath>
using namespace std;
int main() {
// your code goes here
double x, y, z;
cin >> x >> y >> z;
double result = sqrt(12.*pow(x, 4) - 3.*pow(x, 3) + 4.*pow(x, 2) - 5.*x + 6.) - pow(log10(z), 2);
cout << result;
return 0;
}
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